Screw-propeller



(No Model.)

J. SHERMAN.

SCREW PROPELLEB.

N0. 359,103. Patented Mar. 8, 1887.

Zliigfiw Inventor, 4 Jar. 62M A v UNITED STATES PATENT OFFICE.

JONATHAN SHERMAN, OF NORTH \VINTERPORT, MAINE.

SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 359,103, dated MarchlB,1887.

' Application filed October 11, L SG. Serial No. 215,900. (No model.)

To all whom it may concern.-

Be it known that I, JONATHAN SHERMAN, of North Winterport, in the countyof Waldo, of the State of Maine, have invented a new and usefulImprovement in Propellers for Navigable Vessels; and I do hereby declarethe same to be described in the following specification, and representedin the accompanying drawings, of which- Figure 1 is a top view, and Fig.2 a perspective view, of a propeller embodying my invention, the natureof which is defined in the claim, hereinafter presented. Fig. 3 is anedge elevation of one of its wings or paddles.

In my improved propeller each of its wings or paddles A consists of arectangular plate bent lengthwise to an ogee or cyma form, asrepresented, and fixed at its central part to an arm, B, projecting froma head, 0, at one end thereof,such arm being bent lengthwise o'fit inmanner as represented,and arranged obliquely to the axis of the head.The blade, by having the arm attached to it at its central part and notat either edge of such blade, stands with its surface at or about atright angles to the arm both lengthwise and transversely of such blade.The arm, therefore, does not extend from any part of the edge of theblade and in a line with the blade transversely or longitudinallythereof, as shown in either of the United States Patents No. 2,825 andNo. 4,441. On this propeller being revolved in one direction whenimmersed in water and extended from the stern of the hull of a navigablevessel,and applied to a revoluble shaft, as screw-propellers usuallyare,it will advance the vessel; but on being revolved the opposite wayit will effect a backward movement of such vessel..

In practice I have found it very effective and in several respects quiteas if not more efficient than ordinary screw -propellers as commonlymade and used.

I do not claim a propeller having cyma shaped wings fastened at theiredges to arms projecting from a hub,all being as shown in the aforesaidUnited States Patents.

I claim-- The improved propeller, substantially as described,constructed with each of its wings or blades cyma-shaped and soconnected at its central part with its sup porting-arm as to cause sucharm to project at or about at right angles from one face of such wing orblade and obliquely to the axis of the hub, essentially as represented.

JONATHAN SHERMAN.

Vitnesses:

L. A. BARKER,- W. B. FERGUSON.

